共查询到20条相似文献，搜索用时 62 毫秒
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《科技通报》2015,(10)
在路由冲突协议下难以实现对语义检索任务的嵌入式调度,在路由冲突协议设计和网络协议识别中,由于语义检索码在链路负载导致网络通信效率低下,为了提高语义检索任务的调度能力,避免路由冲突,提出一种基于语义相似度融合的Linux嵌入式任务调度算法。通过语义相似度特征模型构建,易于实现语义检索的嵌入式任务调度和路由信息分流。对每组语义相似度特征进行特征融合,得到Linux嵌入式分流矩阵向量长度,进行特征分解,得到样本协方差,实现算法改进。仿真结果得出,算法具有较高的吞吐率和召回率,执行效率较高,检索精度优越,有效提高了语义检索嵌入式任务调度的运行效率。在语义系统构建和检索优化设计中具有较好的应用前景。 相似文献
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网格任务调度的目标是在最短的时间内将任务进行合理分配并实现负载均衡,最终得到实现全局的最优化调度方案.本文提出了一种兼顾任务之间的依赖关系和负载均衡的网格任务实时调度算法.首先,将网格分成若干个簇,每个簇由PC机、任务调度模块、任务控制器、数据集控制器以及数据存储器组成.簇负责接收用户提交的任务,将这些任务存放在本地任务队列中.通过对任务依赖关系的分析,将任务分配给网格的簇,并根据任务的截止期和依赖关系计算任务优先级,优先调度优先级高的任务.仿真实验表明,在Makespan和花费方面,本文算法都优于传统的Min-Min算法. 相似文献
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嵌入式设备中复合型任务最优调度约束模型仿真 总被引：1，自引：0，他引：1
《科技通报》2015,(8)
在ARM和Linux等嵌入式操作系统设计和应用中,为了优化进程管理和内存管理,提高嵌入式设备的运行效率,需要对复合型任务进行最优调度策略规划。提出一种改进的嵌入式设备中复合型任务最优调度约束模型,设计粒子分集聚敛算法实现对嵌入式设备中复合型任务最优调度,和实现对任务调度约束模型的改进,通过进程管理子系统,完成进程的创建、中止、进程间的通信及任务调度,进行特征分解,得到调度迭代方程。采用模糊聚类策略对任务调度管理的数据信息进行约简,可以实现最小的运算量。实验表明,通过该最优调度约束模型,调度算法对整个调度过程的时间开销影响不大,由此提高了调度算法的活性能力,总执行时间节省10%左右,可以使CPU利用率达到100%,展示了其优越性。 相似文献
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基于OSEK标准,构建位域标识优先级的任务调度算法,并在TinyOSEK操作系统中具体实现。通过在系统中定义不同优先级的调度任务,设计试验得出不同优先级的任务调度在商业OSEK和TinyOSEK系统中的时间调度开销,分析并论证基于位域标识优先级的OSEK任务调度算法的实时性和有效性。 相似文献
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在计算机多分簇任务执行中,由于初始能量有限,需要对网络分簇能耗进行优化分配,提高任务执行效率。提出基于剩余能量相干均衡的网络分簇能耗双阈值分配算法,算法考虑了节点当前能量、簇成员数量、簇首与节点间距离,设计了能耗指导的分布式网络能量采集和消耗均衡模型,采用收敛性度量值进行路由分配,实现能耗的双阈值分配,在系统的全局任务调度中心将所有任务进行融合,输入系统总调度器,设计剩余能量相干均衡算法,构建能耗分配的双阈值模型,实现网络分簇能耗双阈值分配。实验结果表明,算法能够降低任务调度关键路径延时,提高low-Vt单元使用率,降低相干功耗,形成最优化能耗管理输出,使得系统更加稳定。 相似文献
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文章提出一种基于混合时隙自适应分配的嵌入式云平台的实时任务最优调度算法,真结果表明,采用本文算法进行嵌入式云平台的实时任务调度的实时性和鲁棒性较好,通过自适应的时分多址时隙分配,任务调度的均衡度提高,性能优越。 相似文献
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为了解决同构多核心处理器任务调度中空调度、无用调度过多,效率较低的问题.提出一种基于反馈约束神经网络的同构多核心处理器任务调度算法.以处理器调度任务完成时间最短为优化目标,建立一个反馈约束的处理器任务调度数学模型,然后采用神经网络算法对其进行求解,并通过有效的约束机制保障计算结果陷入局部最小.计算机仿真测试表明,约束神经网络算法可以获得的同构多核心处理器多任务调度的最优方案,具有一定应用价值. 相似文献
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Linux虚拟服务器(LVS)是一个虚拟的服务器集群系统。在大功率干扰下,LVS集群的抗扰动性能不好,无法有效实现IP负载均衡和任务调度。提出一种基于功率自激的大功率干扰下LVS负载均衡集群抗扰动算法。采用自适应神经模糊系统网络动态干扰监测模型构建网络信息鲁棒性评价模型及Linux嵌入式用户信任感知网络信息信任度评价,计算MAC层两个模糊概念之间的相似度。得到大功率干扰监测数学模型,假设干扰信号表现为一种动态随机噪声信号,实现对大功率干扰下的LVS网络的扰动容错方案设计,对簇节点的接收信号强度(RSSI)信息没有合理开发应用,在簇头生成过程中形成的帧没能实现自适应均衡处理,分析节点之间发射和接收信号的耦合效应,需要实现算法上的改进。仿真结果表明,该算法有效实现IP负载均衡和任务调度,延迟了网络生命周期,提高Linux虚拟服务器的抗扰动性能。 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献
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《中国科学院院刊(英文版)》2014,(3):212-213
<正>In February 2014,the 30th Chinese Antarctic inland expedition team reported that they have successfully conducted the seeing measurement at the Antarctic Taishan Station using a Differential Image Motion Monitor(DIMM)developed by the Nanjing Institute of Astronomical Optic and Technology(NIAOT),Chinese Academy of Sciences.In astronomy,seeing is a physical parameter that describes the irregular movement and blur of the star 相似文献
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XIN Ling 《中国科学院院刊(英文版)》2014,(4):270-271
Amassive overhaul is coming to the Chinese Academy of Sciences （CAS）. To straighten its ＂fragmented, inefficient research＂, the academy has decided to restructure its 104 institutes for better teamwork. 相似文献
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SONG Jianlan 《中国科学院院刊(英文版)》2014,(4)
<正>DNA demethylation in mammalian zygotes,a biochemical process through which the parental genomes let go the epigenetic marks from their"past lives"to obtain totipotency,has long fascinated biologists:how does it happen?A joint team at the CAS Shanghai Institutes for Biological Sciences tells a surprising story. 相似文献
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China is one of the fastest growing economies worldwide. Are science and research also in the fast lane? We talked with LUO Yuan, scientist at the Institute of Coal Chemistry in Shanxi, and Axel Mosig, Professor at Ruhr University in Bochum, who has first-hand experience working and living in China. 相似文献
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Joachim Trümper 《中国科学院院刊(英文版)》2014,(2):201-201
<正>"In 1979 two Chinese scientists joined our institute in the framework of the historical CAS-MPG agreement.This marked the beginning of a longstanding fruitful collaboration.Many visitors followed and contributed to our scientific programs.–My first visit to China took place in 1981–with stays at CAS institutes in Bejing,Nanjing,Shanghai and Kunming,where I received unforgettable impressions of 相似文献
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《中国科学院院刊(英文版)》2014,(3)
<正>May 15,2014Publicly funded scientific research is an important means for the society to create knowledge,support innovation,and promote growth.Research articles from such research are knowledge resources to be shared by all.Their open access will facilitate the dissemination and utilization of knowledge,turn the knowledge produced by public investment effectively into innovation and development capabilities of the society,ensure that public knowledge benefi ts all,and strengthen the innovation driven development strategy.Therefore,Chinese Academy of Sciences(CAS)issues at the present stage the following open access policy for articles from publicly funded scientifi c research projects:CAS requires its researchers and graduate students to 相似文献
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《中国科学院院刊(英文版)》2014,(3)
<正>Between February and March of 2013,the source of avian-origin H7N9 human infection was discovered in Shanghai and Anhui,China.Prior to this,H7N9 has only exhibited characteristics of a low pathogenic avian infl uenza virus,carried by chickens with no known cross-species transmission.By the end of August 2013,Chinese mainland reported a total of 134 confi rmed cases of H7N9 human infections across12 provinces and 42 cities,resulting in 45 deaths.In October and November,Zhejiang Province found three new cases and Guangdong found one case of human infection,suggesting the possibility of a comeback in the fall and winter seasons.Researchers led by Prof.GAO Fu(George Fu Gao)at the Institute of Microbiology,CAS and Beijing Institutes of Life Science,have made progress on understanding 相似文献